<html><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"><script language="javascript" type="text/javascript">document.domain='163.com'; window.parent.returnCount({"演讲":187,"BBC":1642,"国立台湾大学公开课":24,"国际名校公开课":474,"中国大学视频公开课":985,"TED":1787,"可汗学院":64}); </script></head><body></body></html>